ROY VAN DER WONING Well executed and a good start for further development.
For that, I'd like to see more (advanced) splitting criteria though (regular expressions, or at least wild cards for filenames, as well as other file attributes such as size). Also, an option to control the name of the created directories instead of them being generated from the split criteria. This can be done in the preview step which could offer an option to edit the suggested directory names, or beforehand in the hierarchy scheme form using placeholders. The latter would also open a door to creating droplets so one can drop one or more folders onto a desktop icon and have BMFM perform an (unattended) split/merge operation. Finally, it should be possible to do a file move instead of a copy.
(Version 1.0b2)